diff --git a/classes/db/Db.php b/classes/db/Db.php
old mode 100644
new mode 100755
index f408d3af9..be9f1530a
--- a/classes/db/Db.php
+++ b/classes/db/Db.php
@@ -79,12 +79,7 @@ abstract class DbCore
 	/**
 	 * @var array Object instance for singleton
 	 */
-	protected static $_servers = array(
-		array('server' => _DB_SERVER_, 'user' => _DB_USER_, 'password' => _DB_PASSWD_, 'database' => _DB_NAME_), /* MySQL Master server */
-		// Add here your slave(s) server(s)
-			// array('server' => '192.168.0.15', 'user' => 'rep', 'password' => '123456', 'database' => 'rep'),
-			// array('server' => '192.168.0.3', 'user' => 'myuser', 'password' => 'mypassword', 'database' => 'mydatabase'),
-	);
+	protected static $_servers = array();
 
 	/**
 	 * Store last executed query
@@ -182,6 +177,15 @@ abstract class DbCore
 	{
 		static $id = 0;
 
+		// This MUST not be declared with the class members because some defines (like _DB_SERVER_) may not exist yet (the constructor can be called directly with params)
+		if (!self::$_servers)
+			self::$_servers = array(
+				array('server' => _DB_SERVER_, 'user' => _DB_USER_, 'password' => _DB_PASSWD_, 'database' => _DB_NAME_), /* MySQL Master server */
+				// Add here your slave(s) server(s)
+					// array('server' => '192.168.0.15', 'user' => 'rep', 'password' => '123456', 'database' => 'rep'),
+					// array('server' => '192.168.0.3', 'user' => 'myuser', 'password' => 'mypassword', 'database' => 'mydatabase'),
+			);
+
 		$total_servers = count(self::$_servers);
 		if ($master || $total_servers == 1)
 			$id_server = 0;